Using @persist with @key

foo.scala

package com.novus.salat.test.model

import com.novus.salat._
import com.novus.salat.annotations._
import com.mongodb.casbah.Imports._

case class Bar(email: String)
case class Foo[X](jobId: String, bar: Bar, x: Set[X] = Set.empty) {
  @Persist @Key("_id") val guid = jobId + bar.email
}

test-console.scala

salat:0:0.0.8-SNAPSHOT> project salat-core 
[info] Set current project to salat-core (in build file:/home/rose/workspace/salat/)
salat-core:0:0.0.8-SNAPSHOT> test:console 
[info] Formatting 40 Scala sources {file:/home/rose/workspace/salat/}salat-core(test) ...
[info] Reformatted 1 Scala source {file:/home/rose/workspace/salat/}salat-core(test).
[info] Compiling 40 Scala sources to /home/rose/workspace/salat/salat-core/target/scala-2.9.1/test-classes...
[info] Starting scala interpreter...
[info] 
Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import com.novus.salat.test.model._
import com.novus.salat.test.model._

scala> import com.novus.salat.global._
import com.novus.salat.global._

scala> import com.novus.salat._
import com.novus.salat._

scala> val bar = Bar(email = "[email protected]")
bar: com.novus.salat.test.model.Bar = Bar([email protected])

scala> val foo = Foo(jobId = "xyz", bar = bar, x = Set(1, 2, 3))
foo: com.novus.salat.test.model.Foo[Int] = Foo(xyz,Bar([email protected]),Set(1, 2, 3))

scala> val dbo = grater[Foo[Int]].asDBObject(foo)
dbo: com.mongodb.casbah.Imports.DBObject = { "_typeHint" : "com.novus.salat.test.model.Foo" , "jobId" : "xyz" , "bar" : { "_typeHint" : "com.novus.salat.test.model.Bar" , "email" : "[email protected]"} , "x" : [ 1 , 2 , 3] , "_id" : "[email protected]"}